364results about How to "Improve detection resolution" patented technology

The invention provides a hardware Trojan horse detection method and a hardware Trojan horse detection system. The method includes the following steps: collecting a by-pass signal of a to-be-detected integrated circuit; extracting features of the by-pass signal to form a feature collection; calculating mahalanobis distance values, including a mahalanobis value of a reference integrated circuit and a mahalanobis value of the to-be-detected integrated circuit, of the feature collection; comparing the mahalanobis value of the reference integrated circuit with that of the to-be-detected integrated circuit, and performing hardware Trojan horse detection according to a comparison result. By the hardware Trojan horse detection method and the hardware Trojan horse detection system which have the advantages of simple algorithm and short detection time, distinguishability and efficiency of hardware Trojan horse detection in integrated circuit testing are effectively improved, and any cost for hardware is not generated.

The invention belongs to the technical field of non-destructive testing and particularly discloses a phased array ultrasonic testing method based on improved dynamic depth focusing. The method comprises the following five steps of: performing phased array ultrasonic transmission and reception, discriminating a defect, calculating delay time, post-processing echo signals and reconstructing a B type drawing. The ultrasonic echo signals are accurately focused to the position of the defect, so that the problem that the defect is difficult to identify when the signal-to-noise ratio of a reflection echo signal of the defect is too low can be solved; by the method, the problem that the deviation exists between an ideal focus and an actual focus because a material of a tested workpiece is nonuniform can be effectively solved, and the testing resolution of phased array ultrasonic testing of layered media and anisotropic media can be effectively improved; and by the method, the problems that ultrasonic imaging results are fuzzy and distorted due to errors of hardware systems such as phased array flaw detectors can also be solved, and the quality of phased array ultrasonic imaging can also be improved.

A programmable impedance control circuit for use in a semiconductor device having an impedance range shifting function prevents or substantially reduces an impedance detection failure based on an environment change. An impedance detector includes a first array driver, a second array driver, and an impedance matching transistor array and a range shifting transistor array independently controlled by the first and second array drivers. A comparator each compares first and second output voltage levels of the impedance detector with an array reference voltage, and outputs an up / down signal as the comparison result. A counter performs an up / down counting in response to the up / down signal, and outputs control code data. A range shifting circuit monitors a counting output of the counter and so generates range shifting data. Whereby, even if there is an environment change on a manufacturing process, power source voltage or operating temperature, etc., an impedance matching and correction operation can be performed without a waste of impedance matching transistor array and control code.

A high-sensitivity SPR (surface plasmon resonance) sensor includes at least a prism having a first surface on which a metallic layer and a metallic nanoparticle layer are sequentially formed. A light source projects an incident light into the prism through a second surface of the prism. The light is reflected by the metallic layer and the metallic nanoparticle layer and leaves the prism through a third surface of the prism. A light detector detects the reflected light. The SPR sensor has an extensive detection range as compared with the conventional ones and is applicable in the detection of gas, chemical substance, and biomolecule. Moreover, the SPR sensor is advantageous in arranging fabrication process consistently, controlling film thickness, improving product quality, and decreasing fabrication cost.

The invention discloses an electrical detection method and device for leakage of a refuse landfill. The electrical detection method is as follows: arranging upper-layer conducting wires in a clay layer at the upper part of a geomembrane in the landfill; arranging lower-layer conducting wires in a clay layer at the lower part of the geomembrane in the landfill; forming a power supply circuit and a measuring circuit with a power supply electrode and a remote electrode; judging whether holes exist on the geomembrane by utilizing whether current exists in the power supply circuit; and determining the specific respective positions of the holes by detecting potential data of the measuring circuit when the holes exists. A line current source is formed by the conducting wires arranged on the landfill, and leakage detection is carried out by utilizing the space distribution characteristic of the line circuit source, therefore, the problem that the existing detection method has the defects of low resolution ratio, complex wire distribution, high detection cost and the like can be effectively solved.

The present invention relates to a flexible stress sensor. The flexible stress sensor comprises two sensing assemblies; each sensing assembly includes a flexible fiber wire and a nanostructured film coating the flexible fiber wire; the flexible fiber wire is made of a conductive material or the surface of the flexible fiber wire is provided with a conductive layer; the nanostructured film is made of a conductive material or a semiconductor material; the two sensing assemblies are cross-stacked; and the nanostructured films of the two sensing assemblies contact with each other at the intersection of the two sensing assemblies. The present invention also relates to a preparation method of the flexible stress sensor. The flexible stress sensor of the invention has the advantages of small size, high resolution, high sensitivity and simple preparation, is suitable for being applied to miniaturized and integrated equipment and can be used for making wearable equipment for detecting human health.

A six-axis force sensor includes a pair of members, and at least three legs scatteringly disposed between the pair of members on the periphery of the members. Each leg includes a T-shaped leg consisting of a cross beam supported at both ends thereof by one of the pair of members and extending on the periphery of the member in a circumferential direction, and a vertical beam extending from the center of the cross beam to a direction perpendicular to the cross beam and connected to the other of the pair of members. The strains on the legs are detected by first single-axis-type strain gauges and second single-axis-type strain gauges. A first single-axis-type strain gauge is attached to a surface of the cross beam facing the side opposite to the vertical beam or a surface of the cross beam facing the vertical beam, so as to be able to detect a strain generated in the cross beam in a longitudinal axis direction thereof, and a second single-axis-type strain gauge is attached to a side surface of the vertical beam facing in a circumferential direction, so as to be able to detect a strain generated in the vertical beam in a longitudinal axis direction thereof.

A multi-band focal plane array architecture operative to detect multiple spectral image. The multi-band focal plane array architecture has an integrated readout circuit, a plurality of first detectors integrated in the readout circuit and a plurality of second detectors deposited on the readout circuit. Preferably, the first detectors are operative to detect visible signals and the second detectors are operative to detect infrared signals. The first and second detectors are arranged in a checkerboard pattern, in alternate rows or columns, or at least partially overlapped with each other to realize simultaneous detection in two different wavelength bands. The architecture may also have an additional integrated readout circuit flip-chip bonded to the integrated readout circuit. By forming a plurality of third detectors on the additional integrated readout circuit, a tri-band focal plane array may be realized. In one embodiment, a dual-band focal plane array architecture by forming two arrays of detectors on two individual integrated readout circuit and flip-chip bonding these two readout circuits.

An optical system of satellite-borne differential absorption spectrometer comprises a relay optical system and an Offner imaging spectrometer system. The relay optical system is composed of a relay reflector, relay lenses and a color separation filter. The Offner imaging spectrometer system is composed of an incident slit, a convex grating, and a concave reflector. The relay optical system uses the color separation filter to split a detection waveband to form four channels, which are focused by four groups of relay lenses to the incident slit of the spectrometer. Light at each waveband entersthe spectrometer from the incident slit of the spectrometer, is split by the convex grating, and has the light path turned and focused on a detector. The invention utilizes a relay reflector to turn the light path, and utilizes the color separation filter to split the detection waveband into four channels, to therefore improve the detection resolution of the system, ensure measurement accuracy and realize compact volume of the whole optical system. The Offner imaging spectrometer has excellent imaging spectrum performance and reduced distortion. The invention facilitates miniaturization and weight reduction of the whole system, and is suitable for space technology.

The invention discloses a monolithic integrated six-degree-of-freedom micro-inertial measurement unit and a processing method thereof. The monolithic integrated six-degree-of-freedom micro-inertial measurement unit comprises a main unit structure mounted in the center of a glass substrate in a bonding manner, wherein the main unit structure is square and comprises a triaxial accelerometer unit and a triaxial gyroscope unit; the triaxial gyroscope unit comprises four square frames same in structure; a Z-axis detection structure, a driving structure, a Y-axis detection structure and an X-axis detection structure are connected to the inner side edge of each square frame; the triaxial accelerometer unit comprises a central mass block positioned in the center of the main unit structure and twisting-type mass blocks mounted at four top angles of the main unit structure respectively. The monolithic integrated six-degree-of-freedom micro-inertial measurement unit has the advantages of high measurement precision, strong reliability, high panel utilization rate, full decoupling, small mass, low cost, simple and ingenious volumetric structure and the like, can be used for measuring accelerated speeds and angular speeds in three directions at the same time, and is strong in applicability, thereby having a wide market prospect.

The invention belongs to the technical field of non-destructive testing and relates to an ultrasonic testing method used for composite material foaming structures. According to the method, ultrasonic waves formed by a large number of shock pulse waves in the composite material foaming structures are utilized, and by constructing transfer functions of the ultrasonic waves in the composite material foaming structures, the arithmetical relationship between the ultrasonic waves and different part defects of the composite material foaming structures is set up to carry out defect discriminating and ultrasonic testing; the shock pulse ultrasonic waves of different types, intensities and frequencies and ultrasonic testing achieving methods can be selected, and the different composite foaming structures can be tested in an ultrasonic mode. Actual testing results show that the sensitivity, the resolution and the ability of composite material foaming structure testing are remarkably improved, the defects and the combination conditions of skin, skin / foam cementing areas, foam / foam cementing areas and foam areas can be tested accurately, the testing reliability is greatly improved, and the foam testing thickness can be 100 mm.

The invention discloses a tide staff water level measurement method based on dual-waveband imaging, and belongs to the technical field of water level measurement. A camera with a dual-waveband imagingfunction is adopted, and visible light and near-infrared images are used for system calibration and water level measurement links respectively. During the system calibration link, firstly, a measurement system is arranged and a tide staff image of the visible light is obtained; secondly, according to a standard pattern of a tide staff to be measured, a template image is designed; finally througha selected matching control point, a perspective projection transformation relation between the tide staff image and the template image is built; during the water level measurement link, firstly, a near-infrared tide staff image is obtained and then matched with the template image for rectification, binarization processing is conducted on the rectification image, waterline coordinates are measuredin a horizontal projection curve of the binarization image, and according to the physical resolution of the template image, the waterline coordinates are converted into an actual water level value. According to the tide staff water level measurement method based on dual-waveband imaging, the scales and characters on the tide staff do not need to be measured and identified, and the robustness of low-resolution images photographed under a complex site condition is high.

An ultrasonic flow meter for measuring a flow rate in a flow path is provided having ultrasonic sensors each of which includes a semicircular or substantially circular disk shaped transducer. Such transducers are detachably mountable on an envelope of the flow path. The thickness of the ultrasonic sensors in the direction of the length of the flow path is reduced to improve a detection resolution. A plurality of the ultrasonic sensors are mounted on the flow path while keeping a predetermined distance therebetween in a length direction of the flow path, so that the flow rate can be measured from the difference of propagation times of ultrasonic waves between the ultrasonic sensors.

The invention relates to a microwave sensor based on substrate integrated waveguide and a microfluidic technology. The microwave sensor comprises a substrate integrated waveguide reentry resonant cavity and a microfluidic chip embedded into the resonant cavity. The resonant cavity comprises an upper cover plate and a lower base. The upper cover plate and the lower base comprise top metal layers, middle medium layers and bottom metal layers; and two grooves that are symmetrical relative to a transverse axis are etched on the left side and the right side of the top metal layer of the upper coverplate. The microfluidic chip is embedded into a groove in a central area of the upper cover plate. The middle medium layers of the upper cover plate and the lower base comprise a plurality of metal through holes for connecting the top metal layers and the bottom metal layers. Annular grooves are formed in the lower base, and capacitive posts are formed in the centers of the annular grooves. According to the sensor, the microfluidic chip is introduced into the substrate integrated waveguide reentry resonant cavity, and the high-sensitivity and high-accuracy sensor that is non-invasive and reusable and is integrated with other plane circuits easily is obtained through the advantages of a highly-concentrated electric field of the reentry resonant cavity and precise micro fluid control capability of the microfluidic chip.

The present invention relates to a fail-safe safety system to detect and annunciate fractured running rails in electrically propelled transit systems using catenaries or third rail power contactors without the need to induce block by block communication signals currently required by existing systems for detecting occupancy and broken running rails. In addition, unlike existing systems, the present invention is fail-safe, fault tolerant, and self annunciating in that if any component, or connection, of the system fail, or is out of tolerance, it is immediately communicated to a central location. Further, also unlike existing systems, the present invention does not require, or interfere with, automatic train controls because it uses the propulsion power bus, itself fail-safe, as an independent means of communication without additional wiring.

It is one object of the present invention to provide a steering device for a vehicle improving a resolution of detecting a steering reaction force thereby to control precisely a reaction actuator and to improve a steering feeling.The steering device for the vehicle is equipped with a reaction actuator 19 acting a steering reaction force on a steering wheel 1. This device further includes a steering angle sensor 11 detecting a steering angle δh of the steering wheel 1, a controller 20 controlling the reaction actuator 19 according to the steering angle δh, a torque sensor 12 detecting a steering torque Th acted on the steering wheel 1. The controller 20 controls in a feedback way the reaction actuator 11 based on the steering torque Th in a predetermined range including a middle point of the steering angle. The controller 20 drives, in a open-loop way without feed-backing the steering torque Th, the reaction actuator 19 out of the predetermined range of the steering angle δh.

The invention discloses a method for diagnosing a failure of a photovoltaic array. The photovoltaic array is M*N; each string comprises M battery panels and P voltage sensors, wherein P is less than M / L. When measured values of the voltage sensors in a certain string are not in a preset range, whether the battery panel in the measurement range of the rth voltage sensor fails is judged; if the battery panel in the measurement range of the rth voltage sensor fails, a data acquisition system sends a number corresponding to the failed battery panel to an upper computer; if the battery panel in the measurement range of the rth voltage sensor does not fail, whether the battery panels in the measurement ranges of the rth and (r+1)th voltage sensors fail is judged; if the battery panels in the measurement ranges of the rth and (r+1)th voltage sensors fail, the data acquisition system sends numbers corresponding to the failed battery panels to the upper computer; the upper computer receives the numbers and displays the numbers to an operator; and the operator replaces the battery panels according to the numbers. On the basis of guaranteeing the detection resolution by a special connection mode, the number of sensors is reduced, and the cost of a failure diagnosis system is reduced; and furthermore, the photovoltaic array is detected on line through the data acquisition system and the upper computer.

The invention belongs to the technical field of non-destructive detection, and relates to a nonlinear ultrasonic imaging detection method based on automatic scanning. The nonlinear ultrasonic imaging detection method is mainly implemented as follows: a nonlinear ultrasonic unit, nonlinear ultrasonic detection signal acquisition and nonlinear ultrasonic imaging. The nonlinear ultrasonic unit comprises an ultrasonic automatic scanning detection device, a transmitting transducer, a receiving transducer, an ultrasonic unit, a pre processor and the like. By the transmitting transducer and the receiving transducer a nonlinear ultrasonic detection signal is obtained. The nonlinear ultrasonic imaging includes imaging position data construction and imaging display, and comprises the following main steps: determining an automatic scanning mode, arranging and clamping parts, setting parameters, scanning for imaging and the like. Ultrasonic automatic scanning detection equipment with 1-6 coordinate freedom degrees is used for realizing high sensitivity and high resolution nonlinear ultrasonic automatic scanning imaging detection of the parts with different shaped, sized and structured, and the detection capability and reliability of clinging defects and micro defects can be significantly improved.

The invention discloses a microwave photon multiband radar detection method. Specifically, a multiband microwave detection signal generation method comprises the following steps of: combining M pathsof direct-current optical carriers with different wavelengths, and dividing the combined direct-current optical carriers into two paths; modulating a broadband linear frequency modulation signal in one path to generate a sweep-frequency optical frequency comb with M sweep-frequency comb teeth, and keeping the interval between the sweep-frequency comb teeth the same as the wavelength difference ofa corresponding direct-current optical carrier; modulating the other path of optical signal into a single-frequency radio frequency signal to generate a multi-wavelength optical frequency comb signal,and then separating M comb teeth with known wavelengths contained in the multi-wavelength optical frequency comb signal; combining the sweep-frequency optical frequency comb and M comb teeth with known wavelengths into one path, and then performing photoelectric conversion so as to obtain a multiband microwave detection signal. The invention also discloses a microwave photon multiband radar. Themethod has the advantages of high frequency and large bandwidth of photon technology, real-time and high-resolution multifunctional detection can be realized, and the problem of frequency overlappingduring dechirping processing of multiband echo signals is solved.

A vehicle-installed direction detection apparatus is controlled in accordance with the vehicle speed, to detect respective directions of one or more target objects by selectively applying high-resolution detection processing or low-resolution detection processing to received signals obtained from the elements of an array antenna of a radar apparatus, with the selection being determined in accordance with whether the speed attains a predetermined threshold value. The high-resolution detection processing is based on correlation between the received signals, utilizing an null scan type of algorithm such as MUSIC, while the low-resolution detection processing is based for example on digital beam forming.

The invention discloses a medium or heavy steel plate morphology detection system based on a controllable symmetrical double-line laser angle, and a method thereof. A sensor cabinet is internally provided with two planar array CMOS cameras in an equal-height plane. Each planar array CMOS camera is provided with a camera lens and furthermore is fixed on a bracket through a mounting device. Two sides of the planar array CMOS camera are respectively provided with a linear laser source. A pulse speed testing velocimeter is fixed at the side of a conveyor belt. The to-be-measured medium or heavy steel plate is placed on the conveyor belt. The to-be-measured medium or heavy steel plate is provided with the laser ray overlapping area of the symmetrical linear laser sources. Correlation is formed between a photoelectric switch transmitter and a photoelectric switch receiver. The sensor cabinet is placed on a bracket. A detecting device is controlled by a control device. According to the medium or heavy steel plate morphology detection system, simple calibration method is realized in detecting by two symmetrical linear laser sources, and furthermore high detection resolution and high precision are realized. The detecting system with two symmetrical linear laser sources is adopted, thereby realizing large incident angle of the linear laser, preventing detection inflection point failure, reducing drift and ensuring accurate and reliable result.

The invention discloses an underwater sound array device based on an underwater movement platform. The underwater sound array device is connected with the underwater movement platform and comprises anexternally-mounted self-contained collection bin, a multi-channel hydrophone linear array and a mounting mechanism, wherein the externally-mounted self-contained collection bin is externally mountedand fixed on the underwater movement platform through the mounting mechanism; and the externally-mounted self-contained collection bin is connected with the underwater movement platform and is furtherconnected with the multi-channel hydrophone linear array. By utilizing the underwater sound array device, when seismic exploration work is carried out in a deep sea area, the sharp attenuation of sound waves caused by great-depth sea water is avoided, the seismic exploration resolution ratio is increased, and the stratum penetration depth is increased. When the underwater sound array device is applied to hydroacoustic investigation, the underwater movement platform can be conveniently controlled to be sailed and moved to a seabed on the other position and is static again, so that the time forrecycling and rearranging an underwater sound array is saved, and the working efficiency is improved.

The invention belongs to the field of crop pesticide residue detection and biochemical detection, and discloses an automatic portable paper-based micro-fluidic photoelectric detection device and method of pesticide residue. A paper-based chip carrying an indophenol acetate reagent in a first test paper box is conveyed by a chip replacing and conveying belt to a chip installing strip, a paper-based chip carrying an acetylcholin esterase reagent in a second test paper box is conveyed by a chip outgoing and conveying belt to a lower installing strip of an acetylcholin esterase paper-based micro-fluidic chip; a reagent enters a sampling tank through a sampling port, enters an acetylcholin esterase fixed groove under the effect of a paper-based chip sampling channel and is mixed with the acetylcholin esterase; the chip installing strip is driven to move downwards by pressing a component, so that the indophenol acetate reagent and the acetylcholin esterase reagent are in full contact with each other and generate color reaction, and a color region is detected by a photoelectric detection device. The automatic portable paper-based micro-fluidic photoelectric detection device and method are based on an enzyme inhibition reaction principle, obviously improve the detection resolution and sensitivity, and realize an automatic process from inputting a sample to be detected to displaying the amount of pesticide residue.

The invention relates to an ultrasonic field non-contact visualization method for nondestructive inspection and a device thereof. The method includes the steps: a to-be-detected object is placed in an effective area which can be scanned by a galvanometer scanning head; a detection area of the to-be-detected object is determined; a point on the to-be-detected object is selected as a receiving point for a laser interferometer to receive ultrasonic sound signals; a pulse laser instrument successively emits a pulse laser to each point in the detection area, so as to stimulate an ultrasonic wave at each point, and at the same time, the ultrasonic sound signals are received at the receiving point by the laser interferometer and are stored in a computer; according to a reciprocal theory, all-point sound signals which are transmitted to the detection area through stimulating the receiving point by the pulse laser instrument are obtained; and the each-point sound signal obtained by the computer corresponds to a position in the detection area model. Compared with the prior art, the method breaks through the bottleneck that a traditional ultrasonic probe needs to contact the to-be-detected object, achieves on-site nondestructive inspection, and has the advantages of high detection resolution, high bandwidth, high sensitivity and the like.

The invention belongs to the technical field of nondestructive detection, and relates to an automatic scanning-based cellular core sandwich structure ultrasonic imaging detection method. The method is characterized in that defect discrimination and ultrasonic imaging are carried out through establishing corresponding transition functions by using the reflection echo signals of incident pulse ultrasonic waves with different wavelengths in a sheath / cellular core connecting layer, a cellular core connecting layer / cellular wall and a cellular core connecting layer / cellular grid interface. Ultrasonic automatic scanning imaging detection of different cemented and welded cellular core sandwich structures is realized through selecting different incident pulse ultrasonic wave frequencies, an energy transducer and an acoustic beam diameter thereof, scanning stepping, acoustics coupling modes and ultrasonic automatic scanning devices. A practical detection effect shows that the method greatly improves the detection sensitivity and resolution and the detection ability of a cellular core structure, allows defects and combination conditions between the sheath / cellular core, the sheath / connecting layer and the connecting layer / cellular grid, and greatly improves the detection reliability.